1. Department of Dermatology and Allergology, University Medical Centre Utrecht, Heidelberglaan 100, PO Box 85500, 3508 GA Utrecht, the Netherlands
2. Julius Centre for Health Sciences and Primary Care, University Medical Centre Utrecht, Utrecht, the Netherlands
3. Department of Dermatology and Allergology, Wilhelmina Children’s Hospital, University Medical Centre Utrecht, Utrecht, the Netherlands
4. Department of Dermatology, Erasmus Medical Centre, Rotterdam, the Netherlands